M.A.M. Abu-Youssef、Albert Escuer、Dante Gatteschi 等 6 位作者1999-11-23Inorganic Chemistry
Reaction of sodium azide with manganese(II) and pyridine derivatives such as 2-bzpy, 3-bzpy, and 3,5lut (2-benzoylpyridine, 3-benzoylpyridine, and 3,5-dimethylpyridine, respectively) led to the one-dimensional systems cis -[Mn(2-bzpy)(N 3 ) 2 ] n ( 1 ), trans -[Mn(3-Bzpy) 2 (N 3 ) 2 ] n ( 2 ), and cis- [Mn(3,5lut) 2 (…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Dean J. Lee、Jong K. Lee1999-11-23arXiv
As pointed out by Linus Pauling in his classic work on the relationship between crystal packing and ionic radius ratio, a difference in atomic size can be accommodated more readily by an ordered structure than by a disordered one. Because of mathematical complexity, however, very few works have been reported for subst…
Materials Science
R. Haberkern、C. Roth、R. Knoefler 等 5 位作者1999-11-23arXiv
We discuss the preparation of thin icosahedral films (Al-Cu-Fe and Al-Pd-Re) via the route of the amorphous (a-)phase which in some aspects is a precursor to the icosahedral phase. A direct transition from the a- to the i-phase occurs for Al-Cu-Fe films at 430 C on the time scale of minutes. The resulting films are of…
Materials Science
R. Haberkern、C. Roth、R. Knoefler 等 5 位作者1999-11-23arXiv
Amorphous samples of Al-Cu-Fe were crystallized to the icosahedral phase under the control of electrical conductivity and thermopower at a rather small temperature of T=720 K. A comparison between different annealing states of the amorphous and the resulting quasicrystalline phase done on the same sample shows aston-i…
Materials Science
Michael C. Martin、Wayne R. McKinney1999-11-23arXiv
Two recently commissioned infrared beamlines on the 1.4 bending magnet port at the Advanced Light Source, LBNL, are described. Using a synchrotron as an IR source provides three primary advantages: increased brightness, very fast light pulses, and enhanced far-IR flux. The considerable brightness advantage manifests i…
Materials ScienceStrongly Correlated Electronsphysics.bio-phphysics.optics
Leon E. Govaert、P.H.M. Timmermans、W.A.M. Brekelmans1999-11-23Journal of Engineering Materials and Technology
Intrinsic strain softening appears to be the main cause for the occurrence of plastic localization phenomena in deformation of glassy polymers. This is supported by the homogeneous plastic deformation behavior that is observed in polycarbonate samples that have been mechanically pretreated to remove (saturate) the str…
Mechanical Behavior of CompositesPolymer crystallization and propertiesPolymer Nanocomposites and Properties
Y. Madier、C. Descorme、A.M. Le Govic 等 4 位作者1999-11-23OpenAlex
Cerium−zirconium mixed oxides (Ce x Zr (1 - x ) O 2 ), precalcined at 900 °C in dry air, were supplied by Rhodia Terres Rares as monophasic solid solutions. Introduction of some zirconium atoms in the ceria lattice by isomorphous substitution clearly influences the final properties of these materials as long as the cu…
Catalytic Processes in Materials ScienceAdvancements in Solid Oxide Fuel CellsCatalysis and Oxidation Reactions
T. Klaus、R. Joerger、Eva Olsson 等 4 位作者1999-11-23OpenAlex
One mechanism of silver resistance in microorganisms is accumulation of the metal ions in the cell. Here, we report on the phenomenon of biosynthesis of silver-based single crystals with well-defined compositions and shapes, such as equilateral triangles and hexagons, in Pseudomonas stutzeri AG259. The crystals were u…
Nanoparticles: synthesis and applicationsMinerals Flotation and Separation TechniquesChromium effects and bioremediation
Aiko Narazaki、Katsuhisa Tanaka、Kazuyuki Hirao1999-11-22Applied Physics Letters
Effect of poling on surface crystallization behavior of BaTiO3 in 15BaO–15TiO2–70TeO2 glass and on second-harmonic generation of the resultant glass ceramics has been examined. A direct current voltage in a range of 0.3–1 kV was applied to the original glass at around 400 °C, which is above its glass transition temper…
Ferroelectric and Piezoelectric MaterialsGlass properties and applicationsPhotorefractive and Nonlinear Optics
Gershon Rosenblum、B. Sfez、Zvi Kotler 等 5 位作者1999-11-22Applied Physics Letters
Both the “after-pulse effect” and the dynamic characteristics of photostructural transformations induced in glassy As0.5Se0.5 films by pulsed 532 nm excitation have been studied. The after-pulse effect investigation demonstrated more than a 103 times increase of the photosensitivity in case of pulsed excitation. Dynam…
Chalcogenide Semiconductor Thin FilmsPhase-change materials and chalcogenidesNonlinear Optical Materials Studies
Anupam Garg1999-11-22Physical Review Letters
Certain spin Hamiltonians that give rise to tunnel splittings that are viewed in terms of interfering instanton trajectories are restudied using a discrete WKB method, that is more elementary, and also yields wave functions and preexponential factors for the splittings. A novel turning point inside the classically for…
Magnetism in coordination complexesAdvanced NMR Techniques and ApplicationsElectron Spin Resonance Studies
T. Schenkel、A. V. Barnes、Thomas Niedermayr 等 9 位作者1999-11-22Physical Review Letters
We have measured the deposition of potential energy of slow $(\ensuremath{\sim}6\ifmmode\times\else\texttimes\fi{}{10}^{5}\mathrm{m}/\mathrm{s})$, highly charged ions in solids with an ion implanted silicon detector. A large fraction (about $35%$ or 60 keV) of the potential energy dissipated by ${\mathrm{Au}}^{69+}$ i…
X-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy TechniquesIon-surface interactions and analysis
George Floudas、George Fytas、Thomas Reisinger 等 4 位作者1999-11-22The Journal of Chemical Physics
We report on the effect of pressure on the dual segmental relaxation of an athermal poly(isoprene-b-vinylethylene) (PI-PVE) diblock copolymer melt using dielectric spectroscopy. The quantity (∂ log τ/∂P)T is employed as a probe of the state of dynamic miscibility in the system. We find that pressure, unlike temperatur…
Material Dynamics and PropertiesRheology and Fluid Dynamics StudiesBlock Copolymer Self-Assembly
Ranko Richert、R. Böhmer1999-11-22Physical Review Letters
The nature of ion diffusivity in the vitreous conductor $2\mathrm{Ca}({\mathrm{NO}}_{3}{)}_{2}\ifmmode \dot{}\else \.{}\fi{}3{\mathrm{KNO}}_{3}$ (CKN) was studied by nonresonant dielectric hole burning. Spectral holes in the electric field relaxation are probed subsequent to a high electric sinusoidal burn field. For…
Material Dynamics and PropertiesGlass properties and applicationsTheoretical and Computational Physics
Stefan Kettemann、Peter Fulde、Peter Strehlow1999-11-22Physical Review Letters
Low temperature properties of glasses are derived within a generalized tunneling model, considering the motion of charged particles on a closed path in a double-well potential. The presence of a magnetic induction field $\mathit{B}$ violates the time reversal invariance due to the Aharonov-Bohm phase, and leads to flu…
Quantum and electron transport phenomenaPhase-change materials and chalcogenidesQuantum optics and atomic interactions
C. M. Roland、P. G. Santangelo、D. J. Plazek 等 4 位作者1999-11-22The Journal of Chemical Physics
Creep experiments were carried out on amorphous selenium (Se) at temperatures in the vicinity of the glass temperature. The recoverable compliance lacks a plateau, indicating Se chains are too short to form an entanglement network. The measured compliance function was thermorheological complex, even after subtraction…
Material Dynamics and PropertiesBee Products Chemical AnalysisChemical Thermodynamics and Molecular Structure
Kyuichi Yasui1999-11-22Physical Review Letters
Computer simulations of radiation processes in an air bubble and an argon bubble are performed under a condition of single-bubble sonoluminescence (SBSL) based on a quasiadiabatic compression model of a bubble collapse. It is clarified that emissions from excited molecules are strongly quenched by high pressure and te…
Ultrasound and Hyperthermia ApplicationsUltrasound and Cavitation PhenomenaNuclear Physics and Applications
Weili Zhang、H. Wang、Kam Sing Wong 等 6 位作者1999-11-22Applied Physics Letters
We report the measurement of third-order optical nonlinearity (χ(3)) of ZnO microcrystallite thin films near the excitonic resonance at various temperatures using the femtosecond degenerate four-wave-mixing technique. The measured χ(3) response times are 270, 240, and 160 fs at 4.2 K, 77 K, and room temperature, respe…
Chalcogenide Semiconductor Thin FilmsNonlinear Optical Materials ResearchNonlinear Optical Materials Studies
S. Corezzi、E. Campani、P. A. Rolla 等 5 位作者1999-11-22The Journal of Chemical Physics
The dynamics of monoepoxy, diepoxy, and triepoxy glass-formers from below to above the glass transition temperature, Tg, has been investigated through the temperature behavior of relaxation times, strengths, and conductivity, determined in a wide frequency range (102–2×1010 Hz). In all systems the main and secondary r…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesGlass properties and applications
S. Shimomura、N. Wakabayashi、H. Kuwahara 等 4 位作者1999-11-22Physical Review Letters
X-ray scattering study on $({\mathrm{Nd}}_{0.125}{\mathrm{Sm}}_{0.875}{)}_{0.52}{\mathrm{Sr}}_{0.48}{\mathrm{MnO}}_{3}$ has revealed the existence of diffuse scattering in the paramagnetic phase. Its intensity increases with decreasing temperature, but it vanishes at the ferromagnetic transition temperature. This resu…
Magnetic and transport properties of perovskites and related materialsShape Memory Alloy TransformationsAdvanced Condensed Matter Physics